A U.S. Air Force CH-21C Shawnee helicopter in flight over a jungle and villages in Vietnam during the Vietnam War.

U.S. Air Force airplanes and helicopters fly over Vietnam during the Vietnam War. Smoke rises from fields. A U.S. Air Force CH-21C Shawnee helicopter in flight over a jungle and villages. U.S. Air Force B-26B Marauder aircraft in flight.